Indirect ophthalmoscopy lens system and adapter lenses

Details Indirect ophthalmoscopy lens system and adapter lenses Indirect ophthalmoscopy lens system and adapter lenses

A - Human Necessities

61

B

A61B 3/10 (2006.01) A61B 3/12 (2006.01) A61B 3/125 (2006.01) A61F 9/00 (2006.01) A61F 9/007 (2006.01)

Patent

CA 2176385

The invention is directed to an ophthalmoscopic or gonioscopic lens system (10) as well as an adapter lens system for use with such an associated lens ap- paratus. The indirect ophthalmoscopy lens of the in- vention for use in examination or laser treatment of a patient's eye (16) comprises a hand-held, pre-set or fixed system having at least two lens elements each having first and second surfaces. At least one of the lens elements includes an aspheric surface of revo- lution. The at least two lens elements are positioned adjacent one another in a housing, such that the refrac- tive properties of each are combined to converge light from an illumination light source to the entrance pupil (18) of the patient's eye to illuminate the fundus (20) thereof and form a fundus image to be viewed. The adapter lens systems of this invention are designed for use with an associated ophthalmoscopic lens, enabling selective modification of the optical characteristics of the ophthalmoscopic lens system in a predetermined manner. Within the scope of this invention, a plu- rality of attachments make possible change in the net power, optical imaging characteristics, magnification, laser transmission properties or other characteristics of a particular ophthalmoscopic lens.

Système de lentilles ophtalmoscopiques ou gonioscopiques (10) et objectif d'adaptation associé. L'objectif ophtalmoscopique indirect servant à l'examen ou au traitement laser de l'oeil (16) du patient comporte un système tenu à la main préréglé ou fixe d'au moins deux lentilles présentant chacune deux surfaces et dont l'une au moins est une surface de révolution asphérique. Les deux (ou plus de deux) lentilles sont disposées contiguës dans un boîtier de façon à ce que leurs propriétés réfractrices individuelles se combinent pour faire converger la lumière de la source lumineuse sur la pupille (18) du patient afin d'éclairer le fond (20) de l'oeil et à en donner une image. Le susdit objectif d'adaptation de l'invention permet des modifications sélectives prédéterminées des caractéristiques optiques de l'objectif. Plusieurs accessoires, prévus dans le cadre de cette invention, permettent de modifier le pouvoir intrinsèque, les caractéristiques de l'imagerie, le grossissement, les propriétés de transmission du rayon laser ou d'autres caractéristiques d'un objectif ophtalmoscopique particulier.

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